Model
5528A
Squarene
ss
Mea
s
urement
s (In A Horizontal Plane)
18
.
Now
go to the "
PRO
CE
DU
RE
FOR
INSTALLING
THE
STRAIG
HTNES
S
REFLECTOR
",
bel
ow.
Fo
r A M
ac
hin
e w
it
h A Horizontal Spindle
NOTE
A machine with a ho
rizontal
s
pindle
wil
l not have s
pa
ce
behind
the spindle to mount
either
the Straightn
ess
Reflec
tor
or
the
Optical Square.
For
these
ma
c
hine
s,
you will
ha
ve
to
u
se
a
Straightne
ss
Re
lr
or
eflec
tor
to
reverse the
La
se
r Beam.
1. Attach the Optical Square to its Mo
unt
(
See
Fi
gure
12-4) and
or
ient it on
it
s side
so
it
s s
lot
s are
pa
rallel to the
ma
chine's tabl
e.
2.
Ide
ntify
the
axes
you are soing to measure to make
your
Squarene
ss
measuremenl. I
dentify
which
axis
will be your first mea
su
re
ment
axis and
which
will
be
you
r seco
nd
. Try to max
imiz
e
travel paths
for
each
axi
s. (The Optical S
quar
e is fairly large and
will
s
horten
thea
xis
it
is u
se
d
to measure
.)
3.
P
os
H ion the
Opti
ca
l Square
at
the apex
of
yo
ur
square
with
each
of
it
s slots facing o ne
measurement
axi
s.
This s
hou
ld be
out
in front or to the side of the
ma
c
hine
si
n
ce
your
seco
nd
m
eas
urem
e
nt
wil
l
be made
without
the Optical S
quare
and
will
requir
e a Slraight
lin
e fr
om
the L
ase
r
Head
,
throu
gh the Interferometer, and
into
the Reflector.
4. M o
unt
the Vertical
St
rai
ghtn
ess
Kit'
s S
traightne
ss
Re
tro
reflector
where
the
to
ol
normally
mounts, excepl orient it horizontal1y instead
of
vertically. (
See
Figure 12-7.)
Screw the
Int
erfer
ome
te
r
inlo
the large Re
lr
orefle
ctor, using the
tw
o 3
mm
flathead screws
provided.
5,
Orient
the Re
tr
or
eflec
tor
so
the I
nterferometer
line
s
up
with
the ce
nter
of
the
Op
tical
Square's s
lot
opening and the top half o f the Re
lr
orefle
c
tor
is exposed
to
the
la
se
r b
ea
m that
wil
l corne from the other side
of
the
Opti
c
al
Square.
Fasten
the Re
lr
orefl
ector
to the
ma
ch
ine
in such a way that the I
nt
e
rf
ero
meter
is
as
sq
uare as
po
ss
ib
le to the Reflector and to the inco
ming
beam. The
Interfer
o
meter
hous
ing
's
pit
ch
limitation
s
jl
re ±2 degr
ees;
its yaw and
roll
limitations are ± 5 degr
ees
. The
pitch
and
yaw
requir
ements will be taken
ca
re
of
automatically by using the S
tr
a
ightne
ss
Re
tr
orefl
ector and
an
HP
P
os
t.
6.
P
os
ition
the Optical Square relative to the Re
lr
oref
l
ector
and I
nterferom
ete
r.
•
Be
s
ur
e this
es
tablish
es
the " n
ea
r
end
of
travel",
i.
e., that
an
y later
movement
of
I he
ma
chine
ca
n
only
increase the distance between the Optics.
•
Bring the
Interf
erome
ter
/ Ret
rorefle
ct
or
assembly close e
nou
gh
to
the
Optical
Square to line
up
the Inte
rf
ero
meter
with
the ce
lll
er
of
the
Optical
S
quare'
s sia
l.
Be
sure
it
is centered in both axes (
up
-a
nd
-
down
and s
id
e-to-side
).
• This is a very
impo
rtant step. H the Optics are no t physically lined
up
at
this po
int
,
aligning along the tra
ve
l axis
will
be
imp
ossibl
e.
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